Jam-nut



W. 0. HAYTER AND .G. A. FRISK.

JAM NUT. APPLICATION FILED AUG-3|, L920- 7&1.

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Patented Oct. 25, 1921..

.MTED STATES:

a sic "WILBUR o. HAYTER, or xLAMA'rHrALLs, onnson, Ann ever A. nnisx, on a GRIDLEY, camronnra. Y

JAM-NUT.

To all'whom'it may concern: 7

Be it known that we, WILBUR O. HAYTER and GUST. A; F msmcitizens of the United 'Statese'residing 'atKlamath Falls and Gridley respectively, in the counties of Klamath an Butte, respectively, and States of Oregon and California, respectively, have invented certain new and usefullmprovements in Jam-Nuts; of which the following is a specification. This invention relates to nut locking devices and hasfor it's principal object to provide a locking member designed to be threaded onthe shank of a bolt, rearwardly of the .nut and formed so as to frictionally grip the threads of the .bolt so as to prevent any backing off of either the nut or the locking member itself. 7 v r i V A further jobjectfof the invention is to provide a self locking member normally tending to bindit self to the threading of the bolt and provided'with means for loosening its; grip'on the threads, to prevent L'screwing or unscrewing of the lock device f m ebo t a 1 As an additionalobject the invention contemplates the provision-of an improved key means designed tobe applied to locking devices of the above character whereby the gripof 'the l0cking member may be sufiiciently loosened to permit either removal thereof from the bolt or further adjustment thereon. a a

With the above and other objects in view, the invention resides in the details of con struction, combination and arrangement of parts as will be hereinafter more fullypoint- "edlout, reference being had to the accompanying drawingswherein- V .4 Figure 1 is a view illustrating the application of the locking device,

Fig.2 is a similar View with the key or 1 05:6118; in placeL,

'Fig. 3's avertical sectional view. Fig. A; is a horizontal cross section taken on the line sl-+4 of 'Fi'g. 1.1 a r a fFig. 5 is a section taken on the line 5-5 ofFig'.3.' T v V F 6 sa ec-t qna iv w; ake o th line G-G of Fig. 3 and disclosing the man- 7 her in which the beveled edge of the key deviceis received inthe slotted portion of the locking nut and i V a o i i l 7 is ra m t t y d a e view 19 the footed end 'of the key,

Specification of Letters Patent.

vice itself." i l n To provide 'for the adjustment of, the V locking nut or its removal'ii'rfom the bolt, an

"Patented Oct. 25, i921.

Application filed August 31, 1920. Serial No. 407,118. i. H V

In the drawings, l indicates the threaded shank of a bolt and 2a nut screwed thereon. The lockinpqrdevice forming'our invention is providedin the shape of an additional nut member muchsmaller in size-than nut 2 and of spring steel or other elastic material so that it has the nec'essary resiliency required for a locking device of this character.

This lock nut?) is threaded forgengagement with the shank lofjth'bOltjandlls severed '7 on one side by a diagonally extending'slot as shown", thus forming beveled edged ends 4 and 5 respectively These end portions'are bent or sprung so as to normally work away from each other ina laterally o'fiset direction and are normally kept in closely spaced relation by the contractingtendency of thelocking nut. This. contracting tendency results in the inside diameter of the nut being slightly smaller I than the diameter of the threaded shank of. the bolt with the result that when the locking nut 31s threa dedrthereonit becomes slightly expanded against its ow'nresilient orcontractlng'tendency, -'lhe threadsv of the nut are thus causedto adhere to and grip the threadsof the sham As the ends 4 and 5 are sustained in anofiset ordistorted position relative to "one anotheriitjis evident that after they 'havefbeen" brought into' alinement so as to grip thelthrea ds of the bolt and then'releasedthat the tendency to resume their ofisetposition will cause or produce a bindlng stress between the threads of the locking member andfthe bolt'th'rjeads suflicient to bind th l k n i1me ber n place.

' The locking member f may be screwed snugly against the nut2 by the application ,of a wrench in the 'usual' manner and will automatically lock itself firmly to a the threads of the bolt so" as to prevent any backing off of eitherthe nut or the lock de unlocking key or loosener is provided' and as shown compnses a pairof p votally connected parts designed ior' cooperation with f g aconv ni nt finger grip r; the Qo renien nd ing :Qfthe key Eh lo I than? thtaperedshank oisturn l 1 downwardly by the lever action of the key,

wardly at right angles to provide a foot 8 having a beveled edge 9 as shown to advantage in Fig. .7 of the drawing. The foot 8 is designed to be received within a groove or recess 10 cut into the inner face of the end 4 of the locking nut 3 and opening laterally of the nut and adjacent to the slot thereof as shown to advantage in the drawing. When the foot 8 is inserted in this recess or groove, the beveled edge 9 as will be noted from Fig. 6 of the drawing, is positioned forwardly a slight distance beyond the beveled surface of the end 4 and is in snug engagement with the beveled surface of the opposite end 5. The foot thus constitutes a wedge shaped guide and bearing surface on the end 5 so that when the latter is forced it will also be forced outwardly from the :end portion 4 thus expanding the nut and loosening its grip upon thethrea ds of the bolt. The second part. of the key consists in a lever forming strip 11 provided with alower, curved or beveled bearing edge 12,

This lever is pivoted to the shank 6 of the finger strip by means of a rivet or. other suitable fastening means 13. One edge of the lever is provided with a series of notches '14 which are located adjacent the upper end of the lever.

The finger grip 7 has a portion thereof cut away adjacent the pivot 13 and on a side opposite to theflnotches 14 so as to provide a shoulder 15. These notches and the shoulder are for'the purpose of providing means for allowing thejaws of a pair of pliersP or other similar tool to obtain a firm hold for operating'the key in a manner hereinafter explained.

In the application of the invention, the locking nut 3 is screwed upon the shank of thebolt after the nut has first been screwed into place. To apply the locking nut 3 it is necessary that the ends 4and 5 be brought intoalinementin order that the interrupted threads may register one with the other for appropriate engagement with the threads of the bolt, otherwise, the locking device would cross thread the latter. To bring the lock- .ing nut into position for threading on the bolt, the beveled foot 8 of the key is inserted in the recess 10 of the locking nut and the lever 11 moved about its pivot until it assumes a vertical position approximately as shown in Fig. 5 of the drawingg with its beveled edge 12 resting against the raised end 5 of. the nut as shown. A pair of pliers or other such tools could then be employed and is arranged so that one jaw engages the notches14-and theother' engages the shoulder 15 asillustrated by the dotted line structure of the figure just referred to. Upon bringing the jaws of the pliers together, the

lever ll will. be caused't'o swing on a'pivot 13 so that the beveled edge 12, force's-the pliers would tend, it is obvious to draw the foot 8 firmly up against the top wall of the recess during the time that the beveled edge of the le ver member of the key is forcing the raised end 5 downwardly. And since the end is forced downwardly against its own resilient tendency, its resistance to the pressure of the lever is suflicient to bind the same after it has been pivoted to a certain degree, so that the pliers'may subsequently be disengaged from the key without causing dislodgrnent ofthe key from the locking nut. As thus provided the locking nut may be threaded upon the bolt after the usual manner ofa nut and by the application of a wrench until it has been screwed up to the nut 2. A. slight blow on the upper unnotched edge of the lever is suflicient to move the latter enough to releasethe key from the lockingnut, thus leaving the latter free to its expansive action'againstthethreads of the nut. The strain or binding stress which is thus produced between the threads of the bolt and the threads of the elastic portions 4 and 5 of the lockingnut will effectively prevent the locking nut from being shaken or jarredoff of the bolt. The latter thus becomes firmly anchored ,in place and cannot be removed even by the application of a wrench, without distorting or destroying the threads of the bolt, since any attempt to unscrew the lockinginut, without first attaching the. key in place as previously described would only result inthe threads of the ends 4 and 5 crosscutting the threads of the-bolt causing the locking device to become jammed and distorted. To properly: remove the lookbe drawn intoalinement with each other so i as to remove the binding: stress between the threads of the locking nutand the threading ofthe bolt. After this has been done, the

turning of the locking nut, in either direction is quite a simplematter and :the device can then be easily and readily screwed onto or ofilof theboltt From the foregoing description it may therefore be seen' that the present invention provides adevice which can be adjusted for holding an ordinary nut in any place on the bolt and which is self locking in a most positive manner; being capable of adjustment or removal, however, only by the application of associate key means. 7

Having thus described the invention what we claim as new and desire to secure by Letters Patent is z--- A locking nut comprising a flat polygonal body having a screw threaded opening extending therethrough, said nut having a slit extending in a plane diagonal to the axis of the opening to provide overlapping acute angled outer and under ortions, the said portions being displaced ongitudinally of the axis of the opening with respect to each other, the under porton having a recess extending from the side of the nut inward toward the opening whereby one jaw of a clamping tool may be inserted in said recess and the other jaw applied to the face of the outer overlapping portion to draw said portions toward each other.

In testimony whereof we aflix our signatures.

WILBUR O. HAYTER. GUST A. FRISK. 

